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【简答题】
阅读理解。 Students learn their lessons in class. In class teachers teach them. Students sit in the classroom listening to the teacher. This is a way of learning. Is this the only way for students to learn something? Of course not. There is another way to learn. That is, students can teach themselves. For example, if you cannot remember something when you are doing your homework, you can look at your book to find the answer. This is a way to teach yourself. And it is not a difficult thing. We can do this at any place and at any time. How do you teach yourself? The first thing you must do is reading. Read something you are interested in, or you have to read. The second is that you must ask yourself questions. The question is something you don't understand, or you want to know more about it. You can writer down these questions. A clever student is usually good at asking questions. The third is to answer the question by thinking hard, by reading the text or other books, and sometimes by asking other people. This is the way of' teaching yourself. And you must do this all by yourself. If you keep doing like this for a long time, you are sure to succeed in your study。 1. Listening to the teacher is __________for students to learn something. A. not a way B. the best way C. the only way D. not the only way 2. Which of the following is RICHT? A. A student can teach himself only in class. B. It is a bad way to learn from the teacher. C. A student can learn to teach himself if he wants to. D. Students know very well how to teach themselves. 3. If you want to succeed, you'd better learn A. how to teach others B. how to teach yourself C. to read and write carefully D. how to ask questions
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【判断题】( )原子吸收光谱是带状光谱,而紫外-可见光谱是线状光谱。
A.
正确
B.
错误
【单选题】GB 23200.113—2018《食品安全国家标准植物源性食品中208种农药及其代谢物残留量的测定气相色谱-质谱联用法》中样品制备的目的是( )。
A.
最大限度去除杂质
B.
实现后续取样具有代表性
C.
提取待测定成分
D.
纯化样品
【单选题】防止计算机传染病毒的方法
A.
不适用有病毒的u盘
B.
不让有传染病的人操作
C.
提高计算机电源的稳定性
D.
联机联网操作
【单选题】防止计算机传染病毒的方法是( )。
A.
不使用有病毒的盘片
B.
不让有传染病的人操作
C.
提高计算机电源稳定性
D.
联机操作
【单选题】GB 23200.113—2018《食品安全国家标准植物源性食品中208种农药及其代谢物残留量的测定气相色谱-质谱联用法》中进行平行试验测定的主要目的是()。
A.
减少误差
B.
消除背景干扰
C.
进行对照
D.
以上说法都不对
【单选题】食品安全标准是强制执行的标准。除食品安全标准外,不得制定其他食品强制性标准。食品添加剂标准是什么性质的标准。
A.
国家强制性标准
B.
国家推荐性标准
C.
行业标准
D.
团体标准
【单选题】关于食品安全标准,下列哪些说法是正确的
A.
食品安全标准是强制执行的标准。除食品安全标准外,可以制定其他的食品强制性标准
B.
食品安全国家标准由国务院卫生行政部门负责制定、公布,国务院标准化行政部门提供国家标准编号
C.
国务院卫生行政部门可以对现行的食用农产品质量安全标准、食品卫生标准、食品质量标准和有关食品的行业标准中强制执行的标准予以整合,统一公布为食品安全国家标准
D.
没有食品安全国家标准的,可以制定食品安全地方标准
【简答题】《食品安全国家标准食品添加剂使用标准》在2010 年8 月底已经结束征求意见,卫生部等部门3 月1 日正式发布公告,撤销食品添加剂过氧化苯甲酰、过氧化钙,自2011 年5 月1 日起,禁止生产、在面粉中添加这两种物质。 ⑴过氧化苯甲酰在水和酶的作用下,释放出活性氧,可以 __________ (选择“吸附”、“乳化”或“氧化”)面粉中极少量的有色物质,以达到使面粉增白的目的,同时生成苯甲酸,还能对...
【单选题】GB 23200.113—2018《食品安全国家标准植物源性食品中208种农药及其代谢物残留量的测定气相色谱-质谱联用法》选用的内标物是()。
A.
环氧七氯
B.
六六六
C.
对硫磷
D.
杀虫脒
【单选题】防止计算机传染病毒的方法是()。
A.
不使用有病毒的盘片
B.
不让有传染病的人操作
C.
有提高计算机电源的稳定性
D.
联机操作
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